Research Article
The Incidence of Colorectal Cancer Is Decreasing in the Older Age Cohorts in the Zaanstreek Region in the Netherlands: An Age-Cohort Effect
Table 1
Number of colorectal cancer in the different age cohorts in the consecutive years.
| Age cohorts | 31–40 | 41–50 | 51–60 | 61–70 | 71–80 | 81–90 | >91 |
| 1990 | — | 4 | 1 | 6 | 13 | 6 | — | 1991 | — | 2 | 6 | 6 | 11 | 7 | 3 | 1992 | 2 | 3 | 4 | 13 | 20 | 11 | 1 | 1993 | — | 4 | 9 | 12 | 21 | 14 | 1 | 1994 | — | 2 | 12 | 8 | 21 | 9 | 1 | 1995 | 1 | 2 | 17 | 18 | 20 | 14 | 5 | 1996 | 2 | 2 | 9 | 11 | 16 | 10 | — | 1997 | 1 | 4 | 10 | 10 | 22 | 7 | — | 1998 | 1 | 5 | 10 | 16 | 29 | 11 | 1 | 1999 | — | 2 | 7 | 21 | 15 | 13 | 2 | 2000 | 1 | 2 | 8 | 20 | 25 | 10 | 1 | 2001 | 1 | 4 | 17 | 10 | 21 | 11 | 2 | 2002 | — | 6 | 10 | 24 | 21 | 14 | — | 2003 | — | 2 | 12 | 27 | 31 | 17 | 2 | 2004 | — | 4 | 20 | 28 | 28 | 16 | 1 | 2005 | — | 5 | 15 | 37 | 22 | 15 | 1 | 2006 | 1 | 6 | 20 | 30 | 34 | 16 | — | 2007 | 1 | 11 | 14 | 29 | 22 | 20 | — | 2008 | — | 1 | 9 | 30 | 31 | 17 | 1 | 2009 | 2 | 2 | 17 | 32 | 47 | 16 | 2 | 2010 | 3 | 9 | 16 | 40 | 36 | 24 | 3 |
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In 1990, one patient of 28 years was diagnosed with colon cancer; in 1998 and 1999, two patients aged 26 and 30 years were diagnosed with cancer.
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